#include <stdio.h>
#include <string.h>

int main()
{
    float a,b;
    char o;
    scanf("%f%c%f",&a,&o,&b);
    if(o=='+')printf("%.2f",a+b);
    else if(o=='-')printf("%.2f",a-b);
    else if(o=='*')printf("%.2f",a*b);
    else printf("%.2f",a/b);
    return 0;
}